TV is as thin as "paper" How long will the audio revolution wait?
Today's TV sound system is still dominated by built-in speakers. Apart from improved materials and increased surround sound formats, there have been no refreshing changes in functionality.
"The old people have gone by the Yellow Crane, and the Yellow Crane Tower is vacant here." Since the invention of television in the 20th century, television has undergone earth-shaking changes in more than a century, from black and white to color, from analog TV to Internet TV, From standard definition to 4K, 4K has not yet been fully popularized, and 8K is on the scene again. However, the sound system of TV is like a child abandoned by the times, and it has not changed with the change of TV display technology. As of today, TV sound systems are still dominated by built-in speakers. Apart from improved materials and increased surround sound formats, there have been no refreshing changes in functionality.
The evolution of audio technology
For a long period of time, the TV sound system is called accompaniment. TV sound is usually regarded as the auxiliary of the TV picture, so the development of TV audio technology is not as conspicuous as the TV display technology. In fact, with the development of TV technology, consumers have higher and higher demands on TV. As the picture becomes more and more real, the audience has higher requirements for the stereoscopic effect of TV sound, and begins to pursue "holographic stereo ".
Looking at the development of TV audio technology, the most important change in TV audio is the number of playback channels. The human auditory system is a complex information collection system. Humans can not only recognize the basic sound elements such as loudness, timbre, tone, etc., but also distinguish the spatial characteristics of the sound, that is, the distance, direction, etc. of the sound source. Therefore, the development direction of audio technology is to let more and more sound surround TV users from all directions. The first mono or two-channel stereo was too few to create a real sense of presence, so the TV sound system developed multi-channel surround sound, and on this basis, 5.1, 7.1, 22.2 were produced Surround sound formats such as channels. NHK Japan has introduced a 22.2-channel surround sound system for super high-definition televisions. In addition to the horizontal direction, the vertical direction is added. By adding speakers above the user, the holographic stereo effect is achieved.
But the development of TV audio technology may not bring better listening enjoyment to users, because it also depends on the application of audio technology in TV programs. If the TV program uses mono, then no matter how many speakers are installed, the effect will not be qualitatively improved.
The current standard configuration of China's TV program sound system is still two-channel stereo, which has produced a gap of more than ten years with developed regions such as Europe, the United States, Japan, and South Korea. Although Guangdong TV station tried 5.1 surround sound in the program "Bran Poetry" as early as 2003, it was not until 2012 that the program "Good Voice of China" broadcast by Zhejiang Satellite TV really let the surround sound program enter. The audience's home. When the "Good Voice of China" was broadcast in the second season of the following year, 5.1 surround sound became the focus of the program. Subsequently, CCTV, Hunan Radio and Television Group, Shanghai Culture and Broadcasting Group, Guangdong TV Station, etc. also joined the 5.1 surround sound program production. Today, although many TV stations use mono to produce programs, surround sound technology is still only controlled by a few well-capitalized TV stations.
Panel technology restrains the development of TV audio
"Sight" and "listening" are the two most important functions of televisions. The development of the two does not go hand in hand. The development of TV screens is the culprit of the deterioration of TV sound quality. TV display technology from CRT to LCD TV to OLED, we will find that the TV screen becomes thinner and thinner. To a certain extent, it deprives the space of TV speakers.
At present, the most common speaker systems on the market are divided into several types: enclosed speakers, passive radiant speakers, coupled cavity speakers, horn speakers, etc. Although these speaker systems are constructed differently, these speakers need to be reflected and buffered repeatedly to reduce noise and enhance low-frequency vibration to enhance bass. As the TV becomes thinner, the space left for the speaker becomes smaller, and the number of sound reflections and buffers also decreases. This has led to the performance of high- and mid-range frequencies in current TV sets with good speaker materials, but when it comes to low-frequency performances such as drums and footsteps, there will be a sense of violation. Even if a manufacturer adds a subwoofer to the back of the TV, this approach is tantamount to failing to pay if the fundamental problem is not resolved. From this point of view, TV sound is not just stagnant, it even shows signs of going backwards.
In order to make the TV sound system develop forward, color TV developers began to try to extract the sound function from the TV, which prompted the emergence of split speakers. In fact, in 2013, the first TV split speaker appeared in China-Soundbar. Soundbar integrates multiple channels of speakers into a long strip, and each channel has an independent cavity to ensure that the sound has enough space for reflection and buffering. The advantage of this is that it does not sacrifice the space of the TV speakers and retains the sound quality, but this is only to bring the sound quality back to the CRT era.
In scenes that need to be kept quiet, split speakers are obviously not suitable. In a family with children, can the parents only turn off the TV or turn down the volume and sacrifice the viewing experience after the child sleeps? In this regard, people come up with another solution-Bluetooth headset. With the popularity of smart TVs, TVs are basically equipped with Bluetooth chips. But Bluetooth headsets involve transmission rate issues. Currently Bluetooth 4.0 can reach 1Mbps per second, but it is still not fast enough. When users watch videos, there will be more or less delay, and it will cause picture and sound to be out of sync.
Although there are still some shortcomings, the separation of the speaker from the TV is still the current trend in the color TV industry. Doing so can save the internal space of the TV, make the thickest place thinner, and also allow the TV Try more in coding technology.
The latest exploration of TV sound
There are currently two types of audio exploration by manufacturers. The first is Sony's solution. Earlier this year, Sony released an OLED TV, but the most striking thing about this TV is not the front of the screen, but the back. Sony embeds two sound-generating units behind the OLED panel. The vibration of these two sound-generating units makes the screen itself emit sound, and the screen acts as a sound, which Sony calls "screen sound field technology."
The second is the DTS solution, which is a deep cultivation of the channel. This coding technology of DTS can control the sounding unit independently, that is, it can reduce or increase the volume of a sounding unit to highlight a certain sound. Or lower a certain sound.
These two explorations provide very good inspiration for the development of audio technology, and also provide consumers with more imagination. Based on Sony's screen sound field technology, there may be more and more sound generating units behind the OLED panel in the future, and with the increase of the sound generating unit, the amplitude of the same screen will be different, resulting in different propagation paths, after reflection Into the user's ears, and eventually form a surround sound effect. The DTS technology may achieve channel shunting, combined with the split-screen technology and Bluetooth headset, and finally let the same TV play two or more TV series at the same time without affecting each other.
Technology requires people to use their imagination to the extreme, and people also need technology to solve the numerous troubles they encounter in life. At the ever-changing pace of technological progress, perhaps in the near future, the late audio revolution will set off a new climax in the color TV industry.
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